Embroidering-machine.



K. EGGART & D. FISCHER.

EMBROIDERING MACHINE.

APPLICATION FILED OCT. 2. 19l5.

Patented Jan. 23, 1917.

2 SHEETS-SHEET I- K. EGGART & D. FISCHER.

Patented J an. 23, 1917.

2 SHEETS-SHEET 2.

jfliii man srarns earner canton.

KARL EGGART AND DANIEL FISCHER, OF ARBON, SVITZERLAND, ASSIGNOBS TO THE FIRM OF ADOLPH SAURER, OF ABBON, SWITZERLAND.

EMBROIDERING-IEACHINE.

Application filed October 2, 1915.

To all whom it may concern:

Be it known that we, KARL Ecoan'r, a subject of the Emperor of Germany, and DANIEL FISCHER, a citizen of the Republic of Switzerland, residing both at Arbon, Switzerland, have invented certain new and useful improvements in Embroidering- Machines; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

In embroidering machines it is usual to provide means whereby certain of the needles of each series, as for example alternate needles, may be withdrawn temporarily out of operative position on the needle-bar for certain classes of work, while the thread bobbins remain in place and the threads often remain in the eyes of the needles. Devices have also been provided whereby the threads of those needles which are out of action and are slackened may be prevented from being wound up on the thread-roller and from being entangled and broken and from being drawn out of the eyes of the needles. Such devices usually comprise tension wheels which receive the threads between the bobbins and the take-up bars and rest normally, under their own weight, upon the tension or brake-roller which is permitted to rotate at intervals and at other times is held from rotation, like the ordinary threadroller, the tension wheels being usually provided with rubber ringsto rest upon the brake-roller so as to secure, under the influence of the weight of each roller, suflicient adhesion to permit the tension wheel to rotate only as the tension roller rotates. The intention is to permit the threadwheels to rotate only when the brake-roller is released so that the threads may be drawn from the bobbins by the action of the takeup rods only at such times as the tension roller is permitted to rotate. It frequently happens, however, in devices of this kind, that the thread-wheels slip on the threadroller, with consequent uneven delivery of the threads and irregular tension on the threads at the needle-eye and imperfections Specification of Letters Patent.

Patented. J an. 23, 1917.

Serial No. 53,673.

in the embroidery which may render it unsalable.

The object of this invention is to overcome these diiiiculties and disadvantages and to.

insure the regular and even delivery of all of the threads under uniform tension for such needles as are in action, while the tension devices for such needles as are out of action may themselves be put out of action and the entanglement, breaking and withdrawing of the thread be prevented. In accordance with the invention the tension wheel for each thread, which may be turned back out of action when desired, is arranged to be geared to the tension roller or shaft when in. action so as to rotate positively therewith and to be held thereby positively from rotation, as the conditions of the work may require, without the possibility of slippage between the wheel and the roller and the consequent irregularity in delivery and tension.

The invention will be more fully explained hereinafter with reference to the accompanying drawing in which, by way of example and illustration of the character of the invention, difierent embodiments are illustrated and in which,

Figure l is a view in transverse section of so much of an embroidering machine, otherwise of ordinary character, as is necessary to enable the application of the invention to be understood. Fig. 2 is a top view of the parts shown in Fig. 1. Figs. 3, 4-. and 5 are views in side elevation, in section and in edge elevation,of one of the threadwheels shown in Figs l and 2. Figs. 6, 7 and 8 are detail views, on a somewhat larger scale, illustrating certain features of construction of the thread-wheel. Figs. 9, 10 and 11 are views similar to FigsJfi, 7 and 8 respectively, showing a different construction of the thread-wheel. Figs. 12 and 13 are fragmentary views generally similar to Figs. 1 and 2 respectively but showing a different embodiment of the invention.

In the embodiment of the invention shown in Figs. 1 and 2 each thread 1 passes from the usual bobbin 2 through a thread-eye 3, over a thread-wheel or tension wheel 4:, and thence about the usual take-up rods 5 and 6 to the needle 7. The needles are mounted on a needle-bar 8 by means of movable holders 9, each of which can be I erative to inoperative position, or vice versa,

some of the tension wheels being shown in operative position while the alternate wheels are shown in inoperative position or out of action. Fixed to each thread-wheel or tension wheel a is a pinion 11 adapted to engage a corresponding gear 15 which is lined on the tension roller or shaft 16. The latter is mounted in the frame of the machine like the ordinary tension roller, about which the threads are usually passed with one or more turns, and is permitted to rotate or is held from rotation as the operation of the machine may require. The guide-eye 3, before referred to, is conveniently formed in an arm 18 which projects from the hub of the lever 12 and cooperates with a stoprod 17 to maintain the thread-wheel in its inoperative position, as indicated by the right hand wheel 1 in Figs. 1 and 2, the thread also being held by the eye in the arm out of the way so as to prevent entanglement with other threads. The needlebar 8 may be reciprocated in the usual man nor by ordinary means indicated by the links 20, connected to the needlebar and to cranlnpins carried by the oscillating shaft 19. The usual position of the fabric to be embroidered is indicated at 21.

It is necessary that there should be no slippage between each thread and its tension wheel and to that end each wheel is formed, preferably as hereinafter described, with a V-shaped groove which will insure the proper frictional grip between the wheel and the thread, being in this respect in ad vantageous contrast with the usual brakerolls which have their surfaces roughened, as by being covered with emery, or are provided with a covering of velvet or plush or some other material, according to the character of the threads employed, so as to prevent slipping of the threads. As shown in Figs. 3-8, each tension wheel 41 is formed of a fiat metal disk which is slitted radially at the circumference so as to form radial radially to form tongues 23' and 24, which.

are bent inwardly toward each other and are lapped or made to stand each one in a space between two tongues of the opposite disk. Such a V-shaped groove, whether formed in one way or in the other, provides the frictional grip between the thread and the wheel necessary to prevent slipping of the thread with respect to the wheel.

A guard-plate 26 may be supported on the frame of the machine just back of the operative position of the tension wheels to support the loosethreads of the needles which are not in action and prevent them from hanging down.

As shown in Figs. 12 and 13 the movement of the tension wheels 1, to disengage the pinions 11 from the gears 15 on the brake-roller or brake-shaft 16, might be effected by movement to one side, instead of bv swinging them away, as indicated in Figs. 1 and Each wheel is carried as before by a lever 1.2, mounted on a fixed shaft 11, its hub being provided with an arm 27 to rest against a. stop-rod 28, so as to support the wheel with the pinion and gear in proper mesh. To the rod 28 is secured, for each wheel, a flat spring 29, adapted to engage either a notch 30 or notch 31 in. an arm 82, also secured to the hub of the lever 12 and provided with a handle When the spring 29 is in engagement with the notch 30 the pinion 1st will be held, by the pressure of the spring, in mesh with the gear 15 and when the spring 29 is in engagement with the notch 31 the pinion 1-1- will be held out of engagement with the gear 15, the

lever 12 and its connected parts having been 7 moved to one side on the shaft 11.

It will be observed that when the tension wheel is in operative position, whether in the embodiment shown in Figs. 1 and 2 or in that shown in Figs. 12 and 13, or in any other convenient embodiment of the invention, the corresponding tension wheel is en gage-d positively with the brake roller or shaft 16, is held positively from rotation when the brake-roller is held from rotation, and is permitted to rotate only when the brake-roller is permitted to rotate. Thereby all danger of slipping between the tension wheel and the tension roller or brake roller is prevented and regularity and even,- ness of thread delivery and tension are assured.

W e claimas our invention:

1. In an embroidering machine, the combination of a tension shaft, a plurality of tension wheels, means independent of the tension shaft for supporting the tension wheels at a determinate distance from one another, means adapted to connect positively each tension wheel to the tension shaft and means adapted to displace separately each tension wheel to permit its engage mentwith and disengagement from the tension wheel/ 2. In an embroidering machine, the combination of a tension shaft, having a gearwheel fixed thereon, a tension wheel having a pinion adapted for engagement with said gear-wheel, and means to support the tension wheel movably to permit its pinion to be engaged with and disengaged from the gear-wheel of the tension shaft.

3. In an embroidering machine, the combination of a tension shaft, a plurality of gears fixed thereon, a. plurality of tension wheels having each a pinion adapted for engagement with the corresponding gearwheel, and means to support each tension wheel independently and movably to permit its pinion to be engaged with and disengaged from the corresponding gear-wheel of the tension shaft.

4. In an embroidering machine, the comloination of a tension shaft having a gear fixed thereon, a tension wheel having a V- shaped groove and a pinion adapted for engagement with said gear-wheel, and means to support the tension wheel movably to permit its pinion to be engaged with and disengaged from the gear-wheel of the tension shaft.

5. In an embroidering machine, the combination of a tension shaft having a gearwheel fixed thereon, a tension wheel having a pinion adapted for engagement with said gear-wheel, and a swinging lever carrying said tension wheel to permit its pinion to be engaged with and disengaged from the gear-wheel of the tension shaft.

6. In an embroidering machine, the combination of a tension shaft having a gearwheel fixed thereon, a tension wheel having a pinion adapted for engagement with said gear-wheel, a swinging lever carrying said tension wheel to permit its pinion to be engaged with and disengaged from the gearwheel of the tension shaft, said lever having an arm provided with a guide-eye.

7. In an embroidering machine, the combination of a tension shaft, having a gearwheel fixed thereon, a tension wheel having a pinion adapted for engagement with said gear-wheel, a swinging lever carrying said tension wheel to permit its pinion to beengaged with and disengaged from the gearwheel of the tension shaft, said lever having an arm, and a, stop for cooperation with said arm to limit the movement of the lever.

8. In an embroidering machine, the combination with the needles and take-up rods of a tension shaft having a plurality of gearwheels fixed thereon, a plurality of tension wheels having each a pinion adapted for engagement with the corresponding gear wheel and means to support each tension wheel movably to permit its pinion to be engaged with and disengaged from the corresponding gear-wheel of the tension shaft.

In testimony that we claim the foregoing as our invention, we have signed our names in presence of two subscribing witnesses.

KARL EGGART. D. FISCHER.

Witnesses FRANK DIMMEKE, v EMIL MEILE.

Copies of this patent may he obtained for five cents each, by addressing the Commissioner of Iatentl. Washington, D. 0. 

